<!DOCTYPE html>
<html lang="zh">
<head>
	<meta charset="UTF-8">
	<title>Title</title>
</head>
<body>

</body>
</html>
<script type="text/javascript">
  let a=10;
  let bar=function (x) {
	  let b=5;
	  foo(x+b)
  }
  
  let foo=function (y) {
	  let c=5;
	  console.log(a+c+y)
  }
  bar(10)
</script>
